500
The number of Presidents who were scouts or scout leaders (aside from their position as Honorary BSA President which started with William Taft). There have been 18 presidents since the founding of BSA.
What is 8. (T. Roosevelt, L. Johnson, J. Kennedy, G. Ford, J. Carter, W. Clinton, G. W. Bush, B. Obama). Two others (D. Eisenhower and C. Coolidge) had sons who were scouts.